Television tuning apparatus

Details Television tuning apparatus Television tuning apparatus

H - Electricity

03

J

H03J 5/24 (2006.01) H03J 1/00 (2006.01) H03J 3/08 (2006.01)

Patent

CA 2117255

The invention concerns an arrangement including a microprocessor controller, PROM memory, and a digital to analog converter (DAC) arrangement for generating a plurality of control voltages for trimming respective ones of a plurality of varactor controlled tunable filters. The controller couples digital control signals to the respective DACs which generate respective analog control voltages which are applied to the respective tunable filters. A tuning voltage generated by a closed control loop, such as phased locked loop also under the control of the controller, is combined with the output control voltages generated by the respective DAC's in a resistance divider arrangement.

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